411 research outputs found
The Urban Scholars Program at University of Massachusetts Boston
Urban Scholars provides talented and gifted studentsâespecially those from low income and minority backgroundsâwith the resources to develop the skills and self-motivation needed to enter and successfully complete postsecondary education. The program accommodates 120 students, 75 students at the high school level and 45 at the middle school level
The Urban Scholars Program at UMass Boston
Urban Scholars Program provides talented and gifted studentsâespecially those from low income and minority backgroundsâwith the resources to develop the skills and self-motivation needed to enter and successfully complete postsecondary education. The program accommodates 120 students, 75 students at the high school level and 45 at the middle school leve
Spin - Rotation Coupling Observed in Neutron Interferometry
Einstein's theory of general relativity and quantum theory form the two major
pillars of modern physics. However, certain inertial properties of a particle's
intrinsic spin are inconspicuous while the inertial properties of mass are well
known. Here, by performing a neutron interferometric experiment, we observe
phase shifts arising as a consequence of the spin's coupling with the angular
velocity of a rotating magnetic field. The resulting phase shifts linearly
depend on the frequency of the rotation of the magnetic field. Our results
agree well with the predictions derived from the Pauli - Schr\"odinger
equation
Experimental demonstration of direct path state characterization by strongly measuring weak values in a matter-wave interferometer
A novel method was recently proposed and experimentally realized for
characterizing a quantum state by directly measuring its complex probability
amplitudes in a particular basis using so-called weak values. Recently Vallone
and Dequal showed theoretically that weak measurements are not a necessary
condition to determine the weak value [Phys. Rev. Lett. 116, 040502 (2016)].
Here we report a measurement scheme used in a matter-wave interferometric
experiment in which the neutron path system's quantum state was characterized
via direct measurements using both strong and weak interactions. Experimental
evidence is given that strong interactions outperform weak ones. Our results
are not limited to neutron interferometry, but can be used in a wide range of
quantum systems.Comment: 5 pages, 3 figure
Experiences of friendships of young people with first-episode psychosis: A qualitative study
BACKGROUND: First episode psychosis and reduced social networks have been found to go hand in hand, but specific mechanisms are unclear. The manifestation of symptoms and the effect of stigma are two possibilities discussed in the literature but the experiences and views of young people with psychosis have been neglected. AIMS: To explore experiences of friendships of young people with first-episode psychosis, focusing especially on any perceived changes in their friendships or approach to peer relationships as a result of the illness. METHODS: Fourteen participants were interviewed using a semi-structured interview guide, which explored participants' views and experiences of their friendships during the acute phase of illness and in the path to recovery, the impact of friendships on illness experience and of illness on patterns of social contact, and the potential role of services in supporting people with their friendships. Interviews were transcribed verbatim and analysed thematically. RESULTS: Identified themes included the loss of social contacts because both young people developing psychosis withdrew and because friends withdrew as illness developed. Regarding recovery, a unique role was identified for friends and participants were often making conscious efforts to rebuild social networks. Mental health services were viewed as having a limited direct role in this. CONCLUSIONS: Supporting the development of opportunities and skills needed for social relationships following an episode of psychosis may be a useful focus
Observation of a quantum Cheshire Cat in a matter wave interferometer experiment
From its very beginning quantum theory has been revealing extraordinary and
counter-intuitive phenomena, such as wave-particle duality, Schr\"odinger cats
and quantum non-locality. In the study of quantum measurement, a process
involving pre- and postselection of quantum ensembles in combination with a
weak interaction was found to yield unexpected outcomes. This scheme, usually
referred to as "weak measurements", can not only be used as an amplification
technique and for minimal disturbing measurements, but also for the exploration
of quantum paradoxes. Recently the quantum Cheshire Cat has attracted
attention: a quantum system can behave as if a particle and its property (e.g.
its polarization) are spatially separated. Up to now most experiments studying
weak measurements were done with photonic setups. To reveal the peculiarities
of a quantum Cheshire Cat the use of non-zero mass particles is most appealing,
since no classical description is possible. Here, we report an experiment using
a neutron interferometer to create and observe a purely quantum mechanical
Cheshire Cat. The experimental results suggest that the system behaves as if
the neutrons went through one beam path, while their spin travelled along the
other.Comment: 8 pages, 4 figures and 1 tabl
Improvement of the polarized neutron interferometer setup demonstrating violation of a Bell-like inequality
AbstractFor precise measurements with polarised neutrons high efficient spin-manipulation is required. We developed several neutron optical elements suitable for a new sophisticated setup, i.e., DC spin-turners and Larmor-accelerators which diminish thermal disturbances and depolarisation considerably. The gain in performance is exploited demonstrating violation of a Bell-like inequality for a spin-path entangled single-neutron state. The obtained value of S=2.365(13), which is much higher than previous measurements by neutron interferometry, is 28Ï above the limit of S=2 predicted by contextual hidden variable theories. The new setup is more flexible referring to state preparation and analysis, therefore new, more precise measurements can be carried out
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